Cover for tissue boxes



FIG. 1 is a front perspective view of a cover for tissue boxes showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dash-dash broken lines in the drawings represent portions of the cover for tissue boxes that form no part of the claimed design. The dash-dot broken lines define an unclaimed boundary of the claimed design. 

CLAIM The ornamental design for a cover for tissue boxes, as shown and described. 